The mysteries of the Trump-Russia investigation: Known unknowns

From Kate Brannen:

There is so much about Special Counsel Robert Mueller’s investigation into Russian interference in the 2016 election that we just don’t know. Mueller and his team have access to intelligence intercepts, financial records, Trump campaign and transition emails, and hours upon hours of interviews with Trump campaign and White House officials. The special counsel’s office might not have a full picture yet of what happened during the 2016 election, but they certainly have far more of the puzzle pieces than the rest of us do.

Every time there is a major development in the investigation, we learn just how much we don’t know. For example, on the same day the charges against former Trump campaign chief Paul Manafort were revealed, the public also learned about George Papadopoulos, who up until that point was a little-known Trump campaign adviser who had multiple contacts with Russians linked to the Kremlin. Then came the plea agreement of retired Lt. Gen. Michael Flynn, President Donald Trump’s first national security adviser. It revealed that a handful of senior members of the transition team were not only aware of Flynn’s December 2016 calls with Russian Ambassador Sergey Kislyak, but had coordinated the talking points with him. This upended the White House’s narrative that Flynn had gone rogue and raised questions about the White House’s official story that Vice President Mike Pence had been kept in dark about the substance of Flynn’s calls. This bombshell in Flynn’s plea agreement has largely been forgotten in the flood of other news, but it recently led to KT McFarland withdrawing her nomination to be ambassador to Singapore, because now, thanks to Mueller, her lying has also been exposed.

So what are the really big things we still don’t know? In a series of posts, I’m going to examine the investigation’s central mysteries. To kick things off, I’ll start with the most important question:

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